US1791169A - Vertical batch mixer - Google Patents

Description

A. SCHUCHARDT VERTICAL BATCH MIXER Filed Nov. 22. Q1928 lwvzwlofix W ErQQM/ZMV.

' ATTflENET Patented Feb. 3, 1931 Artur orr es AUGUST SCHUCHARDT, F WINGNA, MINNESOTA VERTICAL BATCH IVIIXER Application filed November 22,1928. Serial No. 321,158.

This invention relates to improvements in so-calied vertical batch mixersused for mixing dry and powdered or pulverized products of various kinds including ground feeds for dairy stocks and poultry. An object of this invention is to provide a mixing device of such construction that a thorough mixture of uniform condition is available at its outlet spout. This and other objects are here inafter fully set forth, reference being had to the accompanying drawing, in which,-

Fig. l is an approximately central vertical sectional elevation of my improved batch mixer showing its mixing screw in lower position.

Fig. 2 is a top view of the device taken on a horizontal plane above the driving gear means about as on line 22 in Fig. 1.

F 3 is a sectional detail of the lower part of Fig. 1 as between the two arrows 33 in Fig. 1 and showing the mixing screw of the device elevated.

Referring to the drawing by reference numerals.

5 designates an upright cylindrical mixing chamber the lower part of which is formed tapered as 6 and terminating in a downwardly openingcylindrical spout 7. 8 is a plate valve in the lower part of spout 7 and operable by means of a handle 9. 10 is a suitable top or closure on the hopper or chamber 5 and above which is suitably supported as by braces 11 an elevated frame 12.

13 is a vertical screw shaft or agitator shaft slidably and rotatably mounted centrally in the hopper extending above the top 10 of the device and its lower end being reduced as 13R and rotatably retained in a bearing member 1413 of a horizontal bar 14 fixed diametrically in spout 7. This screw-shaft is suspended by its head 13H which rests on a suitable bearing member 15 (shown as a ball bearing in Fig. 1) which in turn is supported on'the base of a housing 16.

Said housing has a vertically extending threaded rod 17 in central alinement with shaft 13 and extending upwardly and slidably through frame 12 above which its threads engage a correspondingly threaded hub of a chain sprocket 18 connected by a chain 19 with asmaller sprocket 20 fixed now be described.

2 1 is a stationary bearing strut above cover 10 and fixed on suitable frame means 25 on the cover, the bearing or bore being vertical for passage of shaft 13 therethrough, there beinga long feather key 26 on this part of the'said shaft. 27 is a bevel gear on shaft 13 and slidably engaged by the keyed part of the shaft said gear meshing with a drive pinion 28 on a shaft 28S suitably mounted and carrying rotation means such as belt pulleys 29. Thus is provided the means for rotating the screw shaft 13.

30 is a'continuous spiral screw fixed on shaft 13 and extending upwardly from its reduced lower end to height in spaced rela. tion to cover 10, and as shown in 1, with shaft 13 in its lowest position the lower end, of the screw 30 is within the cylindrical spout 7. Manipulation of wheel 23 will cause the entire shaft andscrew to be raised; as

' desired, as to the position shown in Fig. 3

where the lower end of the screw is out of the spout l t.

The function of this screw is to agitate and thoroughly mix any pulverized ground or other substance placed in the container, the screw being rotated in a direction to engage and constantly raise such contents in the central part of the container the contents being forced upwardly and outwardly as indicated by arrows 31 thence falling down within the Walls where they gravitate in the lower tapered part to again be circulated upwardly, this process continuing as long as valve 8" is closed. This action of the spiral screw is of course not new in the art but it is obvious that where no provision is made for raising the screw away from the spout the said screw retards drainage of the contents. After a socalled batch has been thoroughly mixed my the screw shaft 13 for a purpose which will screw raising means are employed whether the screw is rotating or not and a free outlet of contents is provided, said contents dropping down and out of the spout as indicated by arrows 32 in Fig. 3. 33 is an intake opening in cover 10.

Other devices mechanically an equivalent of the mixing screw raising device I have shown, may be used without departing from the spirit and scope of this invention.

I claim:

1. A batch mixer comprising a vertical cylindrical receptacle having a tapered lower hopper portion and an outlet pipe depending therefrom, a valve in the lower end of said outlet pipe, a bearing at the top of said mixer, a second bearing in said outlet pipe alined with said first mentioned bearing, a rotatable screw mixing shaft mounted between said boarings and adapted to be vertically adjusted, the lower end of said screw mixing shaft extending into said outlet pipe, means for rotating said screw mixing shaft, and means for selectively raising and lowering said screw mixing shaftout of and into said outlet pipe.

2. A batch mixer comprising a vertical cylindrical receptacle having a tapered lower hopper portion and an outlet pipe depending therefrom, a valve in the lower end of said outlet pipe, a hearing at the top of said mixer, a second bearing in said outlet pipe alined with said first mentioned bearing, a rotatable screw mixing shaft mounted between said bearings and adapted to be vertically adjusted, means for rotating said screw mixing shaft, a guide stem on the lower end of said screw mixing shaft slidable through said bearing in the outlet pipe, a threaded screw extending from the upper end of said screw mixing shaft, a threaded nut supported upon the upper end of said batch mixer adapted to receive said threaded screw, and manually operable means for rotating said nut to raise and lower said screw mixing shaft at will.

In testimony whereof I atfix my signature.

AUGUST SCHUCHABDT.

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